Molecular diversity of the cyclization reaction of 3-methyleneoxindoles with 2-(3,4-dihydronaphthalen-1(2H)-ylidene)malononitriles
作者:Yu-Ling Lu、Jing Sun、Ya-Jing Xie、Chao-Guo Yan
DOI:10.1039/c6ra00476h
日期:——
The cyclization reaction of 3-methyleneoxindoles with 2-(3,4-dihydronaphthalen-1(2H)-ylidene)malononitrile in ethanol in the presence of DBU at room temperature afforded functionalized 3′-iminospiro[indoline-3,2′-phenanthrenes] in good yields. However, the similar reaction of ethyl 2-cyano-2-(3,4-dihydronaphthalen-1(2H)-ylidene)acetate resulted in functionalized 3-oxospiro[indoline-3,2′-phenanthrenes]
在室温下,在DBU存在下,3-亚甲基吲哚与2-(3,4-二氢萘-1(2 H)-亚烷基)丙二腈在乙醇中的环化反应提供了功能化的3'-亚氨基螺[吲哚啉-3,2'-菲]。然而,乙基2-氰基-2-(3,4-二氢萘-1(2 H)-亚烷基)乙酸酯的相似反应导致官能化的3-氧螺环[吲哚啉-3,2'-菲]和苯并[ d ]菲咯[2,3- f ] [1,3]二氮杂ze取决于底物的结构。此外,3-苯乙叉基亚吲哚与乙基2-氰基-2-(3,4-二氢萘-1(2 H)的环加成反应)-亚烷基)乙酸酯产生螺[吲哚啉-3,2'-菲] -4'-腈衍生物。通过1 H NMR数据和14个单晶结构清楚地阐明了环螺硫辛多环的立体化学。